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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5301ef6ca6a9e9b4d6a8ba6b872f0ce381e26826960c6c2f1fe17ca67099ddc' 
  AND token = 'XpOG+NYyMMK2sYHcxIhuK99bopdzgWvOMPK1y59fwCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}