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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f12c2ae927314edd5ae4262eb50dcd771d06b072697e2ef8427638f6f317c4' 
  AND token = '97WKYi85femvRpU+7Dxu6eZcFAbrciWwy9ueTAspAMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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