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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7ff11a66bd8a73278e364ad47d419dbb9850f8650f56a47cec718388970d48' 
  AND token = 'DQLOaoFIpu58k5T3ygovyIhWb9PM4pZy8tu495QMDj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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