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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd728cf742d405ea2725d482f1deef40484e2af4b24a9558137f0438d50b156d6' 
  AND token = 'QyCAkG6AB46wH0Z3vc/l2ojUpHNx1+/pjXOK3UCe7j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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