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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b4aee9c0836a1e9d9f78be16ab134706a40b5ad9d77e156aab59e4c4fed681' 
  AND token = '2RhZmdE2PnC6XTVYnCHO4R+Z00TWqlkX6bFOYRQNAB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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