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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f61ae038d7bb1f7943042f477a8397b7e21a4368f212ba18bdb3ba060425f7a' 
  AND token = 'Hzov6XLH6wHdGpE60rkf8hEfFuIUB3AVgyWVMpkQATo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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