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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9122d3eb020b598e039e758cabbb2fd2054d83bb789a05b8ab5bbd5fa140dd74' 
  AND token = 'AXoL+pSGNMORlkYMA/l5I0TqQKBTjqfVd73m8gi2ExQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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