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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb20d71bb2510a6a75451368464b991e29c2da8a5d56e39bbefb3f96bff97b6' 
  AND token = 'OFqjV2tDTa6OsJrXXUo0rKxnePM2MB4dTPTkzhtuqdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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