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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a3c05f0c26e7460ed009d8c3e17c1187df140178b2be92b02e70b108c4d7f2' 
  AND token = 'PCKWrox02MW/SjkIA5uFLonppkZyjBuy8yb3FJYFnQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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