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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f69f5bc9005d5a48c8652e41a781634f4b90b2f5e94913ae9fd95435f86f83d' 
  AND token = 'fPW7MMsndt406Y6/xVr7ExOdYtEnEaKu2qzGxGPgUY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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