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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3595886cca936d88e54419347a6d633660e4e55673e3e99bc45fee667d2527' 
  AND token = 'K4ewAkrX57mS3NRVC3dV2BNaZxn0fuxdboMnnYo+7po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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