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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd534c2430b3dd2bd92570d2b45564475831720ac4b422fa56f8cbea9c44d4d38' 
  AND token = 'cmA+E3j8woM91N61fH7jmiO0V1zixCMwQF3bjQEjieE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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