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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf1cb41b38b0ba1cacd91d5c8bd39606d6457f7fb4f7342a149af682ec6e890' 
  AND token = 'Im/OCD4RRER6DEfrasL3PCBwv34DR10QQk+jjBV2LPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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