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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '208f3a57fb758124f86268eb9306afee833f4b7602ca8e9e7e795b86a191d871' 
  AND token = 'QrGa8QqnYadc3z2cUEo0DS6DTwEHWyUYC/qTZyRihnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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