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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e611457788558ee4300a829d64d10b2423bf6644ae645ef83da5848905575ce8' 
  AND token = 'WUuiBtQ71GuwMhTJyxN8pP2Yewdq8Kc7gdsZI9dsjAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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