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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f085d77c6ed76ad3dae906c5197415e1b3568445afa7f906a734f9c2691d5e94' 
  AND token = 'ys3aDrkoyNqvPUWMVh2w1gmnqf7VaiGIwjp0DyUaFUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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