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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8824886b3da91cb059673832f94f67c0f8ecab7a73754babd994911331dced' 
  AND token = 'Mak9EndYNfbWe18voajr0rQjQSzdaBLtvBRsJ3vqXJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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