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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c79d1ae2a1c040471337f9c927f80ffb7432aec659028a6e3417fe6cba6b11' 
  AND token = 'Yzmwr2TB5p4c4k4A3Cnp9Muhuuwi0nQLvLBlOu4L5UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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