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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70881fdbc22523ac2b7c395b7aa299efbf46c6c573402c18b55eee08deb3347' 
  AND token = 'tMUeyAOaA+UasA1W6ZH13MRAkmsScdR5hZk4e08tAOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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