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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b69c5063e109c9227e0645cb67335efce8c478d5369ac7887e96ec96a970d3' 
  AND token = 'DiyIW+jaac/ebJxpBdPqq6YjcX3B9gVC0Z5vX0J+hio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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