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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd086716d7f5fe487a9ff321bf676e6f736686ee0597abb96dae7aab05570289b' 
  AND token = '2mNQpNEEtjA2M+9g9n17Ycds3xXmeLw2sqWqAPtFvSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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