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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e203f524d443439e265c8e274bd94769e118bbb321075a4c5726bf680d57ef12' 
  AND token = 'rKReZP+7Q3XBx3T8fCoysB4U4n+iokLxcemCHTbwBl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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