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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0336b6fc2d89142b7d3dd6f3792a8d8633619ffb7f2c7e1484491fcaf58ffd9' 
  AND token = 'kqHWNJOxbML6MT5L2kREtZYttrZbEjkAv4eZgZ76UdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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