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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f787b0aa4f6a271012397eef608058bc520ff56611b1579c6f247a30f0cbba' 
  AND token = '+XdQXuzMLwKDAYXy+krvOWAPy163EsNvas3PZXDjS/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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