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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9512563141ec99a85ebe60f2b388dbb119779d396e2c95c368cbe55b1dddb4cd' 
  AND token = 'eJyjtA3wo1JWIwhE4BvyF6RNb4N7wIH54+xyDLtMd+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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