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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c525d1cd10bd4e6784b5e737ad7f0aff103d9cb552019b901caa609f64d84f' 
  AND token = 'DaFXOF+r3QS3uB6g23DX9//skdXWxFrbPYmX7DGNtJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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