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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf78d15b65324f10f42e92679d6888b69dbf9e7014b45dd64acfef209773c13f' 
  AND token = '01sdiGfcmhXzBB0e7if4+MqMbsVrmSeSNJZRALhlWto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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