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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79269d3a43ded25e32b94ee5f44c94c2a655825469d8cfdd653baed171b0d8b1' 
  AND token = 'kYJXTTt0mUMQ4IfM/dbOmix0r2xWzE/yVqbbpdWhLmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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