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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79b89b049d893233f413b2baacff043885879d03ec40cec512b2c797e2b84dd' 
  AND token = '5uM3r4f9eVqx0V5VZzc3olbePX7uKtLnkuqS1Y2+CTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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