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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c6521e5e432a79a69d6c3a562427155a01c54b1fef21d33a2d2e1eae9b846b' 
  AND token = '9HK5IT/5viRMksAP9S9smWQYtqcjFQFEmUU4lM9SXqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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