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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63904d719aa57ae70b6eb6d52de7ec898ba3495864b9eef0a2785def46ddd58b' 
  AND token = 'LipacLbzRWaqXVOHP0zF8JlM13FZI15xr/O7G3blYig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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