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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ce2a0123a5c7199da6d2442f82f694d87ec597e950e07862d62c14deab5711' 
  AND token = 'uFYqY5zL8ZUVYIbA+GT7kpqhfJd1+SVb/2dDzNS3Mec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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