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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9d3bf62e04ac9cd0e10ba6e9ca534e6db3b5f92987fd4cf5aab1d0831ab56f' 
  AND token = 'lXGbqzH8lvJwbsO/liuPAEfimfla3GYtBat5pNnPgdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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