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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b26cca37225886d0390e67567245dcbb6423ed8e5dd84a08fb5b24e1ff56ad' 
  AND token = 'fwaa6CvczOp8KFtg078Id7RJgIHQ+qsqwLc6HZmFEds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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