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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fc6879b13630a8e49c43ae6030f00f1c620879c35d9aa89235d6a73f0a68a1' 
  AND token = '9C4Bi2gA5Nuovt9RXTjCfDC+pLCeTXG76AEO4eEpLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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