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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7544047163c9cd1baf12f693b006c4b21f1ccba0eb1cb204d39af139b986eb92' 
  AND token = 'vCF/XFFl8a7flzTTBHBPyxeFrzkQ662LKONtCuh3dNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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