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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ecc10f0ba223e55d72ad34154740b4dde8fca511e9b108dd353b4f9fd18f4f' 
  AND token = 'PsLYEQYD0b5V0Os6eJrQC3or/trYf6KO+J0DIQR6RA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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