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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a9da43f79883353ad8935068ff93f2848506b6115c7418dd2baeab3042ff6c' 
  AND token = 'X/nDWpF0JPhFlPSA477KZE98VMhTjirPCWV87PuTiWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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