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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a412142d204b8073ced0099ad9082442e6f8c968629689a607610537a21e6c1' 
  AND token = 'AxvT3fFld0kprYajW+yM5T7gUF28Ba++BNyQw7malSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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