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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d68a239457e1e7ccd31798dc402a55e8b3d126fd13373af4cbdf8dda5b96681' 
  AND token = '9CjtYnvilSfxwEtF1ONCydlg/fLxACQWA4a3R3HTlqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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