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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9222cac329dc2f30d5ce50208b6c6f6bd5a303286be2a9f95a10d8981ad0a5' 
  AND token = 'PogOVflQO2T6a+nBE0qzL6qZhvLVpuQyqGTosseKwvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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