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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfec4b0c53a188986dfa253d59e32ab227fde30447242e24be2a2eef848273da' 
  AND token = 'COUXLZTXyiaagta6924vTGmS2luhJuRL797Ge/1fU7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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