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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898fa8f4fc07c1f76a4389dad88e588d19d809ecf5dd6d471bf0e82aeecc2838' 
  AND token = '8AUXsiRB2WU+B0Ugel/Wca5dcaXV0e5iJjQ/UFUrPDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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