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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d844e39dc85e13d541a63e76e0efd9b3d88c59b05264f4c627effd0ca6184c' 
  AND token = '2Qob3EhhqHiFBKBk7lTOjYP9TpncQ8D/GeQb0+bwSrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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