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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c076454fe0a786740e356b8afe4f44d8f1c5ef7efbb0d984e86bc1dfaf6001c' 
  AND token = 'erms7leRqkCY5a7Ilcm4f7Hk9geyyfHfQuc2N1ca0J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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