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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be49df7ce2b9dc0bd3c25b4a7aa6c3456f6d7ec699127fe1607a4af30415fc0' 
  AND token = 'shoLuCS9CkVz7fQpgQYiw77nUX6x9A+BnUo5b52d8fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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