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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f014770729e464f0420ec2d98b7895127081e7373cf837db4338f06f76ccb2' 
  AND token = '0LAUvTkLv1vD47nhyJsoJXlV3Y3gDxR0YUczpUqClXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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