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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eb7e4fb056bf4cc01050e1c360ed9c73b44e9b4bda291465a868c8d9248846' 
  AND token = 'hof1E0NxwR+lE1B9JBl7k9PxQDicQbFtsdRmWNoKLGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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