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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4a300f50693df45ad0eeb508facbb6932d12d6aa8490dd1108dee72262dcf9' 
  AND token = 'MXlqFI1o9nwYDvXbpt0YAsg4kwp9F6BGPY0ut0hw4xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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