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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dd3b6b67f2ffdcc84b657a1177fc0777c75004ef259e4419aa2b2c2df95cd2' 
  AND token = 'RAnkMnpO9w/CwyFeoIPgRitUiu5BabJZPUqInjHcL/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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