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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9a901ed932e6482196e6dd30ec4d2a7733096db60b1dded08b4f7dbd6c648b' 
  AND token = 'Pm7+xD1sxvgYiyelZcxG+Ro/zq9RkxIDqyO7wbtzYFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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