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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0ae0d4f4ffdf4a02227fbe71b52b2fc21b79b17c44b59c74215b2915f94471' 
  AND token = 'XGGjZlkiMggqIF92c4BcC5ArqaJo9mLrCmCadzyxo0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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