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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19083ea17f3ec4adbb12913e662b6504c648d68f6c7e9bb775cad07662ff9148' 
  AND token = 'POg6PsGVOWXEXP87iGWOTelcyCRUGQva6eFsOb5YkZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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