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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287504fd7d2c9c87db7865edb744f9c7699ff0979c719a0c86ef8f49ad6b8ec5' 
  AND token = 'eP5mHUAbEguGjGoQB+FYbuZi2w5GL1jSI/4Es+8AG+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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