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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8b51cbeea72ac2f3802dec0d9f77cbec955cc004b648c71d74d441e684ff1e' 
  AND token = '7gaAQjYWP1kxQL8cXXKO67Bwq9auP2E3eAOLqYMdRH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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